Znosko-Borovskii, Evg. A. (Evgenii Aleksandrovich), 1884-1952 · London : G. Bell and Sons, ltd. · leaf 45
they are protected by theKing, whom they in their turn protect. But, as soon as onePawn advances, the position at once changes and the enemyspieces are given squares which cannot be attacked by thePawns. For instance, when the Kt P is advanced (Dia-gram XXIX.) the two squares B 3 and R 3 can at…
Chess -- Middle games
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